No water uptake? What do you all suspect? (DWC)

Charlie_Murphy

Charlie_Murphy

Member
So I've got another thread going on this grow but felt this could use its own topic because of the little to no info I have personally been able to google down lol maybe someone else is having as hard of a time figuring out why their girl isn't drinking.

Here is the basic info I placed a clone in my 5 gal dwc exactly 3 weeks ago I had a immediate case of root rot but have cleared that up as of like a week ago and have had nice new white root growth my ppms are at 300 and I'm running a 600 hps temps are 73-77 and ph is fairly stable and corrected to 5.8 daily my issue is the very slow growth now and the almost zero water uptake in over a day what is the deal I've grown hydro never dwc but I have always had to add water at the minimum of every other day and a decent amount too so I'm at a loss who can help me narrow down the issue I have received input in my other thread boiling down to flush for 24 and see what happens and believe this to be solid advice but just seeing what others recommend or even if anyone can simply explain why or better yet how to get her drinking Thank you guys I'm list without y'all haha
 
hydroMD

hydroMD

Well-Known Member
Is it in a rockwool cube?

Or just in hydroton?

Rockwool can creep in ph so if thats the case try flushing through media with 5.5 ph water mixed at 30% nutes.


If that's not the case, your plant may be going dormant while it focuses on regaining root zone while its in shock.

Still, top feed with 5.5ph at 30% nute concentration for 3-4 days or until new growth is seen, then run 60% until you have a new set of true leaves.


Your old leaves might yellow and die as the plant cannibalize their nutrient reserves to promote new growth... stressed plants take on water mostly so if anything drop ppm for a week.


Also..

Water temp? If your up past 74f you can start seeing problems in fragile genetics. 76f+ and even your robust cuts will start to droop
 
Charlie_Murphy

Charlie_Murphy

Member
Very nice man thank you! Yes it is in a rockwool cube and then into hydroton it has been doing allot of root growing that's for sure so I think your on to something lol at 300ppm do I really need to go 30% on nutrients I feel like I'm under feeding already maybe that's just an easy assumption when looking at the slow growth. If I do need to go to 100ppm just dilute my res with water or new res all together? If rather dilute and Save money on spring water lol
 
rob333

rob333

Well-Known Member
Charlie_Murphy said:
So I've got another thread going on this grow but felt this could use its own topic because of the little to no info I have personally been able to google down lol maybe someone else is having as hard of a time figuring out why their girl isn't drinking.

Here is the basic info I placed a clone in my 5 gal dwc exactly 3 weeks ago I had a immediate case of root rot but have cleared that up as of like a week ago and have had nice new white root growth my ppms are at 300 and I'm running a 600 hps temps are 73-77 and ph is fairly stable and corrected to 5.8 daily my issue is the very slow growth now and the almost zero water uptake in over a day what is the deal I've grown hydro never dwc but I have always had to add water at the minimum of every other day and a decent amount too so I'm at a loss who can help me narrow down the issue I have received input in my other thread boiling down to flush for 24 and see what happens and believe this to be solid advice but just seeing what others recommend or even if anyone can simply explain why or better yet how to get her drinking Thank you guys I'm list without y'all haha
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how do u no its not taking up any water ?? was the clone fully rooted when u put it in also temps of the rez and as a dwc grower my self it is normal for ph to creep up over a day or 2 untill u start with nutes and shit gets stable in ther
 
hydroMD

hydroMD

Well-Known Member
Charlie_Murphy said:
Very nice man thank you! Yes it is in a rockwool cube and then into hydroton it has been doing allot of root growing that's for sure so I think your on to something lol at 300ppm do I really need to go 30% on nutrients I feel like I'm under feeding already maybe that's just an easy assumption when looking at the slow growth. If I do need to go to 100ppm just dilute my res with water or new res all together? If rather dilute and Save money on spring water lol
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30% of recommended dose so your probably fine.


Depending on the size of your cube, a good portion of root mass will be inside. Ph flux and salt build up are big problems with rockwool. Flush that thing asap and wait. 300ppm should be fine.
 
JohnySmith1

JohnySmith1

Well-Known Member
Hi, I have a few questions that I need to diagnose your issue.
1. Do you add calcium and magnesium additives to your feed?
2. Have you soaked your hydroton pebbles in flushing agent for 24 hours, and then in pH 5.8 plain tap water for an other 24 hours?
3. Is the bottom of the basket with hydroton touching water directly?
4. what nutrients and additives do you use and at what ratio?
also picture with hps off would be helpful
 
Charlie_Murphy

Charlie_Murphy

Member
Ok here we go lol first answer is no cal mag as of yet but can get some

second is partly no I did do a heavy rinse and 24hr soak in ph'd water with my rock before using them

Third is another no I have a little over an inch gap between the water and pot maybe even a tad bit more distance than that.

And last I'm running AN Sensi a/b, b-52, atak and great white for roots I mix the a and b I think it took like 5ml each plus another 5ml of the b52 put me at about 300ppm oh and 2ml of atak and a quarter scoop of the GW

HPS off pics coming tonight
 
JohnySmith1

JohnySmith1

Well-Known Member
Charlie_Murphy said:
Ok here we go lol first answer is no cal mag as of yet but can get some

second is partly no I did do a heavy rinse and 24hr soak in ph'd water with my rock before using them

Third is another no I have a little over an inch gap between the water and pot maybe even a tad bit more distance than that.

And last I'm running AN Sensi a/b, b-52, atak and great white for roots I mix the a and b I think it took like 5ml each plus another 5ml of the b52 put me at about 300ppm oh and 2ml of atak and a quarter scoop of the GW

HPS off pics coming tonight
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Ok it's all good, now I can confidently say, it's a cal/mag and nitrogen deficiency. You need to get plant magic magne-cal or similar,where you have a greater concentration of nitrogen and add it to your feed at half recommended dose.
 
hydroMD

hydroMD

Well-Known Member
Charlie_Murphy said:
Ok here we go lol first answer is no cal mag as of yet but can get some

second is partly no I did do a heavy rinse and 24hr soak in ph'd water with my rock before using them

Third is another no I have a little over an inch gap between the water and pot maybe even a tad bit more distance than that.

And last I'm running AN Sensi a/b, b-52, atak and great white for roots I mix the a and b I think it took like 5ml each plus another 5ml of the b52 put me at about 300ppm oh and 2ml of atak and a quarter scoop of the GW

HPS off pics coming tonight
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Wait... you mix the a and b? As in mix in directly with each other? Or adding to water individually?
 
hydroMD

hydroMD

Well-Known Member
JohnySmith1 said:
Ok it's all good, now I can confidently say, it's a cal/mag and nitrogen deficiency. You need to get plant magic magne-cal or similar,where you have a greater concentration of nitrogen and add it to your feed at half recommended dose.
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Its a defeciency but not from a lack of nutrients

Id bet you its lockout from the rockwool... either salt build up, or ph flux.

That plant is stressed and sagging.... if it was defeciencies it would still be taking up water.

Please just fallow my advice and fix your problem within a week you'll have a green turnaround


Just flush from the top and wait. Your plant won't just completely stop growing with a defeciency.


Ps. Hydroton doesnt require leaching for 24 hours. 30 seconds of rinsing the dust out of it is all you need

Rockwool does need leaching but will still rise in ph over time.
 
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JohnySmith1

JohnySmith1

Well-Known Member
hydroMD said:
Its a defeciency but not from a lack of nutrients

Id bet you its lockout from the rockwool... either salt build up, or ph flux.

That plant is stressed and sagging.... if it was defeciencies it would still be taking up water.

Please just fallow my advice and fix your problem within a week you'll have a green turnaround


Just flush from the top and wait. Your plant won't just completely stop growing with a defeciency.


Ps. Hydroton doesnt require leaching for 24 hours. 30 seconds of rinsing the dust out of it is all you need
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hello mate, all do respect but I can't agree with you, here is my point.
It's a rockwool cube, and cubes are usually small, most of the root mass is in hydroton and some in reservoir. As Charlie mentioned, he has been growing in hydro successfully, I assume he knows how to treat this type of medium he also said that his pH is pretty stable. what's more important, by looking at the picture I can see that bottom leaves are donating nutrients to newer growth,it is typical with N deficiency. The way some middle and lower leaves are shaped is typical for magnesium deficiency, it's also causes a very slow growth. I would still wait until we see better picture, before do anything.
BTW about water up-take. Stressed plant of this size, up-take very little water, you won't be able to notice the difference in 24 hrs
 
hydroMD

hydroMD

Well-Known Member
JohnySmith1 said:
hello mate, all do respect but I can't agree with you, here is my point.
It's a rockwool cube, and cubes are usually small, most of the root mass is in hydroton and some in reservoir. As Charlie mentioned, he has been growing in hydro successfully, I assume he knows how to treat this type of medium he also said that his pH is pretty stable. what's more important, by looking at the picture I can see that bottom leaves are donating nutrients to newer growth,it is typical with N deficiency. The way some middle and lower leaves are shaped is typical for magnesium deficiency, it's also causes a very slow growth. I would still wait until we see better picture, before do anything.
BTW about water up-take. Stressed plant of this size, up-take very little water, you won't be able to notice the difference in 24 hrs
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I dont speak on theory, its a problem I have seen countless tines with rockwool. if its a 3" cube or bigger this is the problem. Im guessing the majority of his root mass is indeed inside the rockwool with only tap roots making it through the net pot. If half his root mass is in rockwool, then the ph flux is going to lock out nutrients as well as any salt buikd up.

FLUSH AND WAIT is what 10+ years of dwc experience leads me to advise.

Also he just said hes rebounding from root rot, which means his plant is stressed. .. which is another instance plants use nutrient reserves from lower leaves.


300ppm is enough to keep a tiny thing like that green in dwc.


Im still waiting to hear of he is mixing the A and B directly together, or adding both to a water res.

If he is mixing straight nutrients than he is locking out his npk with salt binding


Defeciencies in dwc usually come from the plant not being able to access nutrients, not a complete lack of nutrient available in the medium.
 
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Charlie_Murphy

Charlie_Murphy

Member
Hey guys thanks and to answer the question no I do not mix the base nutes together prior to the res I add the atak first as per the labeled recommendation then the A and mix it in then repeat with B and so forth the cube was a small one and I actually have a really good amount of roots all the way to the bottom of my bucket
 
JohnySmith1

JohnySmith1

Well-Known Member
Charlie_Murphy said:
Hey guys thanks and to answer the question no I do not mix the base nutes together prior to the res I add the atak first as per the labeled recommendation then the A and mix it in then repeat with B and so forth the cube was a small one and I actually have a really good amount of roots all the way to the bottom of my bucket
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Choice is yours mate, what you want to do with your plants, however I got to say, I am 100% sure it's a cal/mag deficiency. In any case good luck
 
hydroMD

hydroMD

Well-Known Member
Charlie_Murphy said:
Hey guys thanks and to answer the question no I do not mix the base nutes together prior to the res I add the atak first as per the labeled recommendation then the A and mix it in then repeat with B and so forth the cube was a small one and I actually have a really good amount of roots all the way to the bottom of my bucket
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Then you can assume it is not lockout and feed accordingly.

Always start with intangibles when encountering problems with dwc.

Most nutrient lines willb have more than enough of everything for your girls.
 
Charlie_Murphy

Charlie_Murphy

Member
Ok cool I think I'll try a little bit of it all haha first I swoop up some cal mag and add it to my res then my thought is if we suspect build up or whatever in the cube and hydroton then for the sake of saving nutes can I keep my res water and put plant into empty bucket and just pour say a gallon of ph'd water with cal mag added to that over the hydroton to rinse the possible buildups out and then return it to my res ?
 
JohnySmith1

JohnySmith1

Well-Known Member
Charlie_Murphy said:
Ok cool I think I'll try a little bit of it all haha first I swoop up some cal mag and add it to my res then my thought is if we suspect build up or whatever in the cube and hydroton then for the sake of saving nutes can I keep my res water and put plant into empty bucket and just pour say a gallon of ph'd water with cal mag added to that over the hydroton to rinse the possible buildups out and then return it to my res ?
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Perfect
 
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